Computer looks good but...
$120 USD for UPS Ground? It's $40 from your zip code to New York, New York. I'm not sure how you calculated that price.
VIA USPS media mail, a 24"x24"x12" 27pound box ships for $13.84 for the same set of zipcodes!
You cannot ship a computer via. media mail, but you can ship it via. parcel post. And yes, $120 is high, even for UPS Ground, half that would be close methinks.
As a buyer and seller we will get the exact address and I will weigh the computer accurately, I've estimated the 25lb.